Revision history [back]

the cascade training tools can no more be built in opencv4, after a lot of arcane C-api code was removed.

since you cloned the github repo, you can easily fall back to the 3.4 branch, where those tools are still intact:

git checkout 3.4

then clean your build folder and restart with cmake.

note: it's 2019, and you should rather use some SSD,RCNN or yolo network for object detection, they're much faster / accurate.